Hack saw



Dec, 14 Q1926. 1,610,381

J. JACOBEY HACK SAW Original Filed March 17. 1923 2 sheets-$11551: 1

JOHN /460552 Qwuentoz 3513 g q 1 D i Dec. 14 ,isze.

v J. JACOBEY HACK SAW Original Filed March 1'7. 1923 2 Sheets-Sheet 2JOHN Jqc 05 av s. M 2 n Patented Dec i' f sf ' naoxisewi 11 fpplication.filedgiiiarhuz"mesa-serial No.' 62'5,7'1 3:Renewed's'Novemb'er.1151926.

q Thisp'invention relates to improvements 'in .hackjsaws I .Themainobjectsof this inventionare to a dog pivotally positioneddownwardiand-ofthe haokwsawYframeythe othervendcof saidprovide an adjustmentframeportion, said adjustment being ymade by means of} a telescopeyofadjusting meansforming the back I portion of/said frame. Thisachustmentis provided with a'loc king means consistingof dog provided witha'plurality of teethrfor,

engagement -with'- a plurality of notches formed on a lower side of themain back portion of the hack .saw' frame.v The inner dog end beingforced into contact'with the upper teeth of-tlie frame cline casingmember.

A still" further ob to provide a handle structure pivotally seby meansof an-incured to the inner downturned end of the main back portion ofthe frame of said i saw. The upper. end of said'handle being providedwith a spring controlled latching means for tightening the hack saw bladwhen placing either in a horizontal or ver-' tical position on the'hacksaw frame;

A still further object is the providing of a dual manner in attachingthe hack saw blade to the hack saw frame and connect parts. in such away that it is not necessary to use thumb screws, nuts or the like, forsecuring said blade.

Further objects andobjects relating to structural details willdefinitely appear from ment of my invention, is clearly illustrated inthe accompanying. drawings forming a part of this specification, 1nwhichr Figure 1 is aside elevation of mygiiin.

proved hack saw. i p

Figure 2 is a detailed portion of Figure 1 as indicated by line 22. i

Figure 3 is a detailed portion of Figure 1 as indicated by the line 33.

Figure 1 is a detailed perspective view of the upper-portion of handle,showing spring controlled latching means.

Figure 5 is aside elevation of the hack saw blade removed, and one partof the telescopic frame portion in cross SGOtlOIl, in

ject of the inventionfis' EEZEQE. j

order to [show thei means of adjustingis aid frame.

.Figure-P'Gwisa detailed. viewrshowing a a portion of -F igure 5 whereinthe *SBGHLIHQ means arenin. contact. 7

j Figure -1sa. cross section of Figure- 5.

that. I have provided? a .hacksaw frame con sisting of two principal 1members. Member 1;-is -telescop'ed' withini a secondmember; This secondmember Q is provided-with a casing end3 having an .inclined bottomportion .4." Themember 2 'isprovided with a a. time :Bv referring toFigured it WiH fbeQ-seen pivot 5 for securing of a down turned outer'member 6 ofthe fram'e'proper. fThisdown turned outer member 6 isprovided with a pivotally secured dog 7 secured inthe down turned outermember'6 at point 8; By referring to Figure 7 it will be seen that thiss'ecuringmeans is secured by means of enlarged ends 9, functioning overthe in nerridge 81 of theopening at point 8; V

-By referring to Figure 5 it will be seen that, when it is-desired toadjustthe frame,

the down turned outer member 6 is swung outwardly on the pivot 5,thereby drawing dog 7 ,carrying the teeth 10 from the engage-. ment withthe' notches 11, formed on the under edge of the frame member 1. Thisdog 7 is provided'with an upourved surface 12 which engages with theinner inclined surface 18 of the inclined bottom portion 4;

By referring to Figurefi it'will be seen that when the frame members -1and 2 are .telescoped to a desired position, the frame "parts 1 and 2aremade secure by. press- 7 ing inwardly upon the down'turned outermember 6, thereby forcing the. teeth 10 of the dog 7 to engage in thenotches {11' and rigidly. securing the" above mentioned members bycontact of the curved portion 12 of the dog 7 against the inner inclinedsurface 13 of the inclined bottom portion 4. The saw'blade 14 asindicated in Figure 1 may now be positioned upon the outwardly extendinglug 15 formed on'the surface 16 of the down turned outer 'memher 6. lug15 is turned outwardly slightly less than ninety degrees in order thatthe blade-will becaused to press down snugly against the surface 16'whenthe blade is placed under tension, the manner of which The other will bedescribed hereinafter. endof the blade is secured toa lug 17'which isformed upon the side surface 18 in an inclined manner as shown anddescribed for lug 15. In orderto tighten th'e'blade, the operatormaypress the handle 19, thereby.

causing'the handle 19 to swing upon the pivot 20 which secures the lowerend 21 of the framefportion l to the handle 19. v The 3 gagementwithnotches 25 formed on the upper portion of the frame-member 1. In

order that the latching arm QQ'm'aybe held in tension in relation to thenotches 25, a

' spring 26'is secured to the upper end of the handle 19 in such amanner and form as to also provide a thumb rest 27, inwhich, when it is'desiredto' place the blade in a horizontal position in relation to theframe, the

Vilhat I claim is a I 7 An extenslble sa-w frame comprising one blade'ispositioned upon'an outer lug .28 of thedown turnedouter member 6 and alug 29 on the bottom portion of the handle por- V tion19 at point 30. IV

frame member telescoping within asecond casing member, "a casingfori'ne-d upon the inner end of one of said frame members, an

inclined bottom portionof said casin g -a plurallty of notches formedupon theunder side of the frame member telescoping within'thecasing;member, a downwardlyprojecting member pivotally secured to said casingmember, a dog pivotally secured to said downwardly projecting member;said dog provided'with a plurality of teeth upon an upcurved end portionof said dog.

' "In testimony whereof Ialfix; my signa- 40 turel 7 JOHN JACOBEY.

